what is wrong with this?

[stormogulen]

Hi,

Can someone please help me explain, why this doesn't work? The problem is
the xs:key and xs:keyref. I can only reference the last of the
"afsnit"-nodes (number 302). Whenever I try to reference number 301, I get
the error: 'Undefined values for keyref identity constraint AfsnitFK' (using
xmlspy 2003).

Why, oh why?

----------------------------------------------------------------------------
--

<?xml version="1.0" encoding="UTF-8"?>
<kalkulation xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="s.xsd">
<tilbudsliste>
<afsnit id="301">
<navn>a</navn>
</afsnit>
<afsnit id="302">
<navn>b</navn>
</afsnit>
</tilbudsliste>
<pris afsnit="302"/>
</kalkulation>

------------------------------
s.xsd --------------------------------------------

<?xml version="1.0" encoding="ISO-8859-1"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="afsnit">
<xs:complexType>
<xs:sequence>
<xs:element name="navn" type="xs:string"/>
</xs:sequence>
<xs:attribute name="id" type="xs:string"/>
</xs:complexType>
<xs:key name="afsnitPK">
<xs:selector xpath="."/>
<xs:field xpath="@id"/>
</xs:key>
</xs:element>
<xs:element name="tilbudsliste">
<xs:complexType>
<xs:sequence>
<xs:element ref="afsnit" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="pris">
<xs:complexType>
<xs:attribute name="afsnit" type="xs:string"/>
</xs:complexType>
<xs:keyref name="afsnitFK" refer="afsnitPK">
<xs:selector xpath="."/>
<xs:field xpath="@afsnit"/>
</xs:keyref>
</xs:element>
<xs:element name="kalkulation">
<xs:complexType>
<xs:sequence>
<xs:element ref="tilbudsliste"/>
<xs:element ref="pris" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>

 

[Klaus Johannes Rusch]

Can someone please help me explain, why this doesn't work? The problem is
the xs:key and xs:keyref. I can only reference the last of the
"afsnit"-nodes (number 302). Whenever I try to reference number 301, I get
the error: 'Undefined values for keyref identity constraint AfsnitFK' (using
xmlspy 2003).

Why, oh why?

This location of the xs:key element in the schema gives the context node in
which the constraint holds, with the constraint as you have it defined, you can
even insert multiple afsnit elements with the same ID (since the key is only
defined for each element).

If you place the xs:key in the containing element with a selector selecting
afsnit, it will work just as you expect it:

<xs:element name="tilbudsliste">
<xs:complexType>
<xs:sequence>
<xs:element ref="afsnit" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
<xs:key name="afsnitPK">
<xs:selector xpath="afsnit" />
<xs:field xpath="@id" />
</xs:key>
</xs:element>

<xs:element name="afsnit">
<xs:complexType>
<xs:sequence>
<xs:element name="navn" type="xs:string" />
</xs:sequence>
<xs:attribute name="id" type="xs:string" />
</xs:complexType>
</xs:element>

(remainder of your XSD file unchanged)

Hope this helps